According to the diagram above, how are metamorphic rocks formed? A. Wastes deposited by plants and animals decompose and weather. B. Other rocks experience intense heat and pressure. C. Molten rock cools and turns solid. D. Sand and other particles are buried, compacted, and cemented together.

In an old-fashioned amusement park ride, passengers stand inside a 3.0-m-tall, 5.0-m-diameter hollow steel cylinder with their backs against the wall. the cylinder begins to rotate about a vertical axis. then the floor on which the passengers are standing suddenly drops away! if all goes well, the passengers will “stick” to the wall and not slide. clothing has a static coefficient of friction against steel in the range 0.60 to 1.0 and a kinetic coefficient in the range 0.40 to 0.70. part a what is the minimum rotational frequency, in rpm, for which the ride is safe? express your answer using two significant figures. f f = rpm